Pile-hammer.



T. E. STURTEVANT. PILE HAMMER.

APPLICATION FILED APR.8,1916.

1,226,272 Patented May 15, 1917.

2 SHEETS-SHEET l.

#WEA/70B' TTORNE Y -T. E. STURTEVANT.

PILE HAMMER.

I mi Patented May15,1917.

2 SHEETS SHEET 2` f /NVE/vrof? WM Armen/fr THOMAS E. STUR'IEVANT, OF DOVER, NEW JERSEY.

PILE-HAMMER.

Specification of Letters Patent.

Patented May i5, i917.

Application filed April 8, 1916. Serial No. 89,777.

To all 'whom t may concern.'

Be it known that I, THOMAS E. STURTE- vAN'r, a citizen of theUnited States of America, and a resident of Dover, Morris county, and State of New Jersey, have invented certain new and useful Improvements in Pile-Hammers, of which the following is a specification, reference being had to the accompanying drawings, forming a part thereof.

My invention relates to power hammers and has special reference to pile hammers which are operated by compressed air, steam or other elastic motive fluid, and valve mechanisms therefor.

One object of my invention is to provide a pile hammer that shall be substantially prismatic in form, all projections or lugs being avoided eXceptsuch as pertain to the flexible hose connections.

Another object is to provide a compact pile hammer having all of its working parts inclosed so that they are not subject to injury or disarrangement by coming in contact with anything exterior to the machine.

Another object is to provide a device of the aforesaid character that shall embody a particularly simple valve and valve-operating mechanism. The valve mechanism of my invention consists of a single piece cam rod having a simple formation and provided with a pair of cam surfaces to cooperate directly with and be actuated by cam surfaces in the hammer block of the machine.

Other objects and advantages of my invention will be set forth hereinafter, and .in order that my invention may be thoroughly understood I will now proceed to describe the same in the followingspecication and then point out the novel features thereof in appended claims.

Referring to the drawings:

Figure 1 is a longitudinal section of a pile hammer arranged and constructed in accordance with my invention and constituting an embodiment thereof.

Figs. 2 and 3 are transverse sectional views taken on the lines 2 2 and 3--3 of Fig. l.

Fig. fl is an elevation of the hammer block.

Fig. 5 is a longitudinal section taken on the line 5-5 of Fig. 2; and

Figs. 6, 7, 8 and 9 are partial transverse sections taken respectively on lines 6, 7 8 and 9 of Fig. 1. l

The structure illustrated comprises a relatively long prismatic body of rectangular section, composed of an engine cylinder 10, a hammer guide barrel 11. a cap 12 at the top, a bottom head 13 and an anvil block retainer 14.

Operating within the cylinder 10 is a piston 15 which is connected by a piston rod 16 to a hammer block 17.

The barrel 1l. has a cylindrical bore to receive the hammer block 17 which reciprocates therein. The hammer block is provided with a longitudinal groove 18 to cooperate with a projection 19 of a guide block 20 which is set into a suitable hole 21 in one side of the barrel. The hammer block is provided on the opposite side with a cam groove 22 formed to provide cam surfaces 23 and 24.

Opposite the guide block 20, is a bearing block 25 which is set into a suitable hole 26 in the barrel and coperates with a cam rod 27. The guide and bearing blocks 20 and 25 are not essential but I prefer them as they permit the barrel to be simple and inexpensive in construction. The cam rod 27 has a semi-cylindrical section 28 (see Figs. 8 and 9) which is twisted through a suitable angle or formed otherwise to provide a double cam surface 28a to coperate with the cam surfaces 23 and 24 of the hammer block (see Figs. 8 and 9).

The engine cylinder 10 consists of a relatively massive block having a centrally located cylindrical bore 29 in which the piston 15 operates and a relatively small offset cylindrical bore 30 which communicates with the here 29 and constitutes a valve cylindcr. Mounted within the valve cylinder is a valve 31 which is cut away in sections as clearly shown in Figs. 6 and 7 to provide ports through which the steam or compressed air passes to and from the cylinder.

The valve 31 at its lower end is notched as indicated at 32 to cooperate with a key projection 33 of the rod 27 which is cylindrical at its upper end and extends into the valve cylinder 30. The arrangement of parts is such that the rod and valve are operatively connected and at the same time the structure may be readily taken apart if desired, the members 10 to 14 inclusive, being securely bound together by tie rods 34 in the usual manner.

The cylinder section 10 of the device is furthermore, provided with longitudinal passages 35 which communicate with the eX- haust L 36 and a passage 37, which communicates with an inlet L 38. The valve cylinder 30-c0mmunicates with the inlet and exhaust passages in the usual manner as clearly shown in Figs. 6 and 7.

An anvil block b9 is mounted in the retainer 14 and is in position to be struck by the hammer block 17 while the pile hammerl is in operation.

The substantially square section of the prismatic body of the device as illustrated, conveniently allows for-the tie rods 34, but of course some other section such as a circle or a hex; gon may be used.

The operation of the hammer is as follows: Assuming that the parts occupy the positions in which they are illustrated, the cam 24 has actuated the cam rod Q7 as shown in Fig. 9. The valve is now in position to admit the motive fluid from the inlet passage 37 to a port 40 which communicates with the cylinder opening 9.9 at its lower end. The motive fluid, thus admitted, forces the piston 15 outwardly and raises the hammer block 17. This motion of the hammer block causes the cani surface 24 to actuate the cam rod which in turn produces an os- The lowerv cillatory movement of the valve. end of the cylinder opening 29 is `by this means connected to the exhaust and motive fluid is admitted through a port 41 to the top of the cylinder opening. The piston is thus reciprocated and raises and lowers the hammer block 17.

It is evident that the cam surface 2SA of the rod 27 is double, being composed of two oppositely inclined parts, one on each side of the middle of the twisted section of the rod.

The entire device is permitted to rest upon the pile which is to be driven with the anvil block 39 in engaging the top of the pile. The hammer block strikes the anvil block for each stroke of the engine and the entire device is lowered as the pile descends to keep the anvil block always in engagement with the top of the pile. The cap 12 has an eye 43 which is adapted to receive the hook of a crane or derrick.

Attention is particularly directed to the fact that the hammer has the form of a prismatic block of metal with no lateral ledges or projections likely to be broken in handling the device. The valve is a one piece structure, and the cam rod is also composed of one piece having a very simple form. Furthermore, the hammer block coperates directly with the cam rod in producing oscillations thereof and ofthe valve.

The structure illustrated may be modified in various ways within the spiritand scope of my invention, and I intend that only such limitations be imposed as are indicated in the appended claims.

What I claim is:

1. A power hammer comprising an engine cal oscillatory valve and formed to provide surface, and a pair of an oscillatory bearing earing surfaces ad]aoppositely inclined cent to the hammer block and coperating Y with the cam surfaces thereof, whereby a reciprocatory movement of the hammer block e'lects an oscillatory movement of the valve. 2. A power hammercomprising an engine having a cylinder, 4a piston and a valve,'a barrel externally continuous with the cylinder, and connected thereto, a hammer block connected to the piston7 adapted to reciprocate in the barrel and .provided with a pair of oppositelyinclined external cam surfaces, and a solid one-piece-'semi-cylindrical cam rod directly connected to the valve at one end and formed to provide oppositely inclined camsurfaces to coperate with the respective cam surfaces of the hammer block. 3. A hammer comprising a prismatic body havino' an engine cylinder, a barrel and tie rods for securing the parts of the body together, a piston for the engine, va hammer block connected to the piston and mounted to slide within the barrel, a valve for theengine and means dependentdirectly upon the movement of the hammer block for operating the valve. 1 v 4. A hammer comprisingaprismatic body having an engine cylinder, a barrel, an anvil block retainer and tie rods for securing the parts of the body together, a piston for the engine, a hammer block connected to .the piston and mounted to slide within the barrel, a valve for the engine, an anvil block, and a cani rod substantially parallel to the movement of the hammer block and actuated thereby for operating the valve. i Y 5.. A hammer comprising aprismatic body having an engine cylinder, a barrel, an anvil block retainer and tie rods for securing the parts ofthe body together, a piston for the engine, a hammer block connected to the piston and mounted to slide within the barrel, an anvil block held by the retainer in position to be struck by the hammer block, an oscillatory valvefor the engine and a cam rod in the barrel, said hammer `block and cam rod having coperating cam surfaces Vwhereby the reciprocatory movementof the bloclrprodiices an oscillatory movement .of the valve rod. Y,

6. A hammer comprising a prismatic body having an engine cylinder, a barrel, an anvil izoV block retainer and tie rods for securing the parts of the body together, a piston Vfor the engine, a.V hammer block connected to the piston and mounted to slide Within the barblock and cam rod having,` eoperatng cam rel, an anvil blockheld by the retainer in surfaces whereby the reeiprocatory moveposition to be struck by the hammer block, ment of the block produces an oscillatory 10 an oscillatory valve for the engine, a cam movement of the valve rod.

rod in the barrel, a bearing block for the rod In Witness whereof, I have hereunto set and a guide block for the hammer block on my hand, this 6th day of April, 1916.

opposite sides of the barrel, said hammer THOMAS E. STURTEVANT.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, D. C. 

